Bit for taper boring



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1 l l I l I l l I I l I RJuly s, 1930.

J. CQSTELLQ BIT FOR TAPER, BORING Filed Nav. 12. 1924 3 Sheets-Sheet 3 Afro/w57@ Patented `luly p8, 1930 Lithia` oosfrianrio EXEoUeToRs or slain...Toi-nt.eoosmurino,A DECEASED; y y

y Birrort Terna noem-G1 1 I k.Applicatien filed Noveniber 12, SerialdYf-lg, I

- invention relates to animprovement in pack bits and more particularly to abit ifor taper boring.

` The object of my inventionk is `top rovid'e a Vbit bymeans of which abore may `be tapered Having novv indicated; in al general vvay,

vl`the nature and purpose of nay-invention, I

Will proceed -to a detailed description there`y r feed rod g. The-rod o islpreventfed--froinendof, With-reference to thelaccor'npanying draw- V ings ,in which Ihave illustrated a `preferred l bit by means ofthe engagement of collars r y bearing ,s'secured to the'bodyof the bit.y I

:embodiment thereof, and in Which,

" Fig. 1 is a plan .vievv ofa b't embodying :c

my invention. f j f. Y f -Fig. 2 isa vside elevation of the bit shown Figure 1.;

' Ffgf isa slde view of a portion ofthe feed offthebody, due to the divergence of theslots an enlarged end ,view thev bit shown in Figures 1 yand 2Q l.25 f Fig. 5 is a side vievv,-partly broken' away,

@of the subject'of Figure 4. Y Fig. 6 is an elevation of a ing showing feed rod drive.V

Fig. 7 is a side view of the'subject of Fig. 6, partly in section. f

nection with a pilot.

`Spaced back from versely of its axis, asatf, and is slotted,

' parallel to the axis, as at'gto forman arm Aquadrant isf provided with. a plurality of 4o L, `adjacent the free end of which provision is made for the reception'of a cuttingtool` 'i adapted to be adjustably secured Vby meansofbolts y'. 'Similar provision is inade for adjjustably securing a cutting vtool 7c to thebody opposite to theV tool z', though the *use of: a second tool, as lc, is not necessary.V i Y An undercut groove Z "fs cutfn the bod)T parallel to the slot g and a similar groove Z',

Aextending at an angleto the slot-g,'is' cut in 5o the arm It, so that the slot Z in its-extension Inyinvention are yto 'pro- ,benoved' toward the rear ofthe bit the free boringbar bear- Jduringthe advanceof the vbit, Whichmay vbe i a representsrthebody of a pack bit-having at its rear a shankb provided with 4a cross: key slot o, forconnection Wit-ha boring bar A ,Iand a shank e at its forftvard end, for con- :1

the-forward end and y adjacent one side,the body isr drilled trans- M from the forward end of the arm 72, diverges i froln-'the slot 'Z and fornriguidesl on thej body v portion and arno h. The! adjacent Walls of .the slots Zandflvarefin'ishedfto provide bear-l ingsfor pro] ections on a slide m, which pros?? jections are adapted tobear at 'their forward and rear ends'in theslot Zand attheir forwardr end only,in`the slotjZ, as Vshtwvnin Fig.' 5 While the body portion embraces the'guides.V

n lCarriedby the slide-'is ak nutorinternallyl threaded portiony fn, adaptedforithegrecepe v tion of the threaded end'of a `rod Q, adapted tobeconnected forrotationj,as at p,'ftoa Wise v'nioyement relative to i the'v body a 'of the on opposite sides o'fa lt-Will novv be observed that if the slide/m end ofarm hvvilljbe inovedfftovvardf the axis Z and-Z', and the depth of cut koffthetool z' 'will bev reduced. If-the `slide is thus Inoved 4as ithe'bit is advanced in a bore; the tool e Will produce a tapered bore.

` For-the purposez of moving the slidefmv accomplished by rotation of the threaded end o'f rod o in V,nut/n, -feed rodg isprovided`r with -a'helical groovet, adaptedto be enteredby a key u-iadapted to vbe secured to a quadrant Vv, adjustably secured on the rear l lface ofthe :boringbar-bearing, of abo'ring Y l:.-l

machine of usual construction. .K n s The quadrant@ is provided Withanarcuate slotw'through Which are adapted to ,pass n bolts :c for securingthe quadrant, in adjustedv position, to the boring barl bearing `and Lthe spaced {slo'tsI fz/ for the receptionV of` the ,key

` u, which adapted to be `secured tothe quadrant'by a screws, in order that' byadjustment of the quadrant itself andsel'ection of a slot the 'keymay be enteredfin fthe groove that they feed rodfvvill beturnedfby the enlois possessed ofiesiliency and whei'rdiawn'in by the slide'tends to spring out-to normal position, thus setting up an opposing force to that of the slide, which tends "to 'retain' the arm in any position into which it isdrawn and enables it to be drawn in with great accuracy., v v

Itwill. he understood that'if a second; tool, as tool c, isused,-sueh tool `will 'be adjusted initially nto cut/ron `a -di-ame'ter equal to the minimum diameter ofthe'taperedbore to be produced, while lthe tool i twill 'be-initially adjustedto cut on adiameter equal lto'the maximum'diameter offthe taperedbore to be produced. e,

It -Vwill -begobvious'thatiany desired taper within predetermined limits may -be produced by `relatively proportioning the degree of divergencefof-the slots-Z and'Z and the ftravel of. slide .m1, `to Ithe length .of the' bore to lbe produced, f but -mo're'simply by vvarying the pitch'offthe helical groove cut in rod g so lthat-in:conjunction with the fthread in nut n it will move slide m and'tlool i at the .proper rate.`

Itzis obviousitliat the'rodg maybe rotated by a cam,yor`by,=gears-orin any convenient w'ay, i and I- do tnot confine rmyself to 'the spline shaftmethod illustrated. K

Having now. fully describedrmy invention, what I claim fand desire Ito' protect by Letters Patent is: Y

fl. A Ybit :for 'taper boring comprising a body. portion, `an .arm formed integral 'with the lbody, and extending longitudinally of, said body, a' lcutting 'tool secured adjacent thexfree end oi? .said arm, means engaging said body :and arm fand adaptedjto vbe conltinuously actuated inthe operation of the bodyA to move the lfree end of the-arm toward the axis of said body. Y

2L A bit for ltaper 'boring comprising a body portion, an arm formedin, andextending longitudinally ofvafnd having one of its ends .x'ef'd relative to'l said body, a cutting tool `secured adjacent the free end Aoif said arm, a gide'ons'ai'd body and extending parallel tothe .axis thereoi, a guide on said arm extending aftan angle to .theaxisofsaid body,

@Slide-embracing Seid siede, and means t0 move .saidslide to Vcafuse the'-r'eeenfd of said arm to be drawn toward the axis of said `3. YAbit compfisinga body portion Slotted `longitudinally from forward endto ori'n Vboring barto'rotate said feed rod.

said-body, and means to rotate-saidscrew.

4. A bit comprising'a bodyn portion slotted longitudinally from its forward end to form 'an"ai'm, a cutting tool secured adjacent the free end of said arm, a groove in said body extending parallelto the axis thereof, a

' groove in saidarm extending atan-angle to said'rst-mentionedgroove,'a slide in said grooves, a nut carried by said slide, a screw engagingsaid'nut,meansito prevent endwise movement of said'screwrelative'to saidbody,

a helically grooved feed'rod' connectedto said 4screwf'afborin'g bar'connected :to said body,

a fixed keyV entered in the groove in said rod and adapted-as the bit is advanced by said Y5. A'bitcomprising a bo'dy'portion slotted longitudinally romfits forward end to form an arm, a cutting.- toolsecured adjacent Vthe free end' of'said'larm, aigroove lin said body extending parallely tol the axis thereof, a groove insai'd arm extending at an angle to said first mentionedl groove, a slide in said grooves, a nut carried by said slide, a screw engagingsaid nut, 'means toprevent endwise movement of said screw relativetof'sa'id body, a heIca-lly grooved feed rod connected to said screw, a boring bar connected to said body, artixedsupport `for said feed rod and boring bar, a quadrant' adju's'tably secured to -fsaid'sup'po"it, .a'pl'urality of slots in said quadrant for alignment with" the groove 'in Vsaid 'feed "rod, a lrey adapted to be entered in the groove in said Vfee'dl rod and in an :aligning.slot:in4 said quadrant, and means to secure said key to said quadrant.

6. Abit'tor'tap'er boring comprising a body portion, an ari'n extending A-longlritudinally of said body andv kvformed integrally therewith :adjacent one end, a cutting (tool secured to said arm, means to move 'the Ytree end of said larm towardl the axis of ith'elbody and resilient means'for resisting 'the 'movement of the free 'end' oef the' arm 'toward said axis.

7.' Afbit for taper 'boring comprising a body portion, an ar'rn secured'at one end to, and ex-4v tending,longitudinally of, s'aid body, a cutting-tool secured'ladjacent the free end of said iarm,' =a vgroove iorin'ed in the body, a groove formed insaiid arm', one of said grooves ex-v tendmg at `an -ang-le to the other, a slide extending rom 'groove to groove and'embracingguidesI formed `between said grooves, and means to mov'e vsa-idslide to cause the free end of said arm to draw-n toward rthe axis of .sa-ifi Vany.

iio

portion, an arm 8. A bit for taper boring comprising a body and extending longitudinally a portion of said body, a tool securedto said arm adjacent its free end and means continuously and posi' tively actuated by the forward movement of said bit adapted to move the free endlof said arm toward the axis of said body.

9. Abit for taper boring comprising a body portion, an arm extending longitudinally of said body andhaving one of its ends'xed relative to said body, a cutting tool secured to said arm adjacent its reeeend', a guide on said body extending parallel to the axis thereof, a guide on said arm extending at an angle to said irst mentioned guide, a slide embracing said guides, and means to move said slide to cause the free end of saidarm to be drawn n held in a normal position,

toward the aXislo said body. l

10. A bitcomprising a body portion slotted longitudinally from its forward end to form an arm, one end of which is Vfixed relative to said body, a cutting tool secured to said armadjacent the tree end thereof, a groovein said body extending parallel tothe axis thereof,

a groove in said arm extending atan angle to said first mentioned arm, a slide in saidv grooves, a nut carriedby said slidea screw engaging said nut, means for preventing endwise movement of said screw relative to said body and means adapted to be operated'in the boring operation of the bit for rotating said screw. Y y' 11. A bit for taper boring comprising a body portion having a slit therein forming an arm adapted to carry a tool,thefree end of the arm being movable relatively to saidbodyy portion, guides on the body and arm, and a slide embracing the guides on the body portion and the arm for positively controlling all movement of the free end of the arm relatively to said body portion.

12. A bit for taper boring comprising a body portion, an arm secured at one end to the body portion and adapted to carry a tool, the free end of the arm being movable relatively to said body portion and. resiliently guides on the body and arm, and a slide embracing the guides on the body portionand operative during the operation of the tool for positively moving said arm inwardly of said normal position toward the axis of relative movement between the tool and work.v

13. A bit for taper formed integral therewith Vsaid relative Amovement the arm automatically Y imparting sliding movement to said member. 14. A bit for taperl boring comprisinga body p ortion,an arm secured at one end to Ythe body portion and adapted to carryy atool', the 'freefend of the arm beingmovable relatively to said body portion: in fa direction transverse to the ment between the the body and arm,l ing the guideson said arm and said bodyportion whereb'ysliding movement of said member'moves the'free end of said'arm relatively` to said body portion, and means actuated by for moving said slid-1 tool and work, guides on` ing member.

In testimonyV of which invention, Ihave hereunto set .my hand, at'Philadelphia,'Penn direction of relative` movea sliding member embrac- Sylvania, on this 10th day oi' November, 1924.` i

JOHN cosrnLLo.` Y'

boring comprising a body portion, an arm secured at one end to l the body portion and adapted to carry a tool,

the free end ofthe arm being movable rela' y tivelyto said body portion, `guides on the body and arm, a sliding member embracing the guides on vsaid arm and said-body portion l whereby sliding movement of said member operative during theoperation of the tool for ,o

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